The optical and mechanical design for the 21,000 actuator ExAO system for the Giant Magellan Telescope: GMagAO-X

Laird M. Close; Jared R. Males; Olivier Durney; Fernando Coronado; Sebastiaan Y. Haffert; Victor Gasho; Alexander Hedglen; Maggie Y. Kautz; Tom E. Connors; Mark Sullivan; Olivier Guyon; Jamison Noenickx

doi:10.1117/12.2629553

29 August 2022 The optical and mechanical design for the 21,000 actuator ExAO system for the Giant Magellan Telescope: GMagAO-X

Laird M. Close, Jared R. Males, Olivier Durney, Fernando Coronado, Sebastiaan Y. Haffert, Victor Gasho, Alexander Hedglen, Maggie Y. Kautz, Tom E. Connors, Mark Sullivan, Olivier Guyon, Jamison Noenickx

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218524 (2022) https://doi.org/10.1117/12.2629553
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

GMagAO-X is the ExAO coronagraphic instrument for the 25.4m GMT. It is designed for a slot on the folded port of the GMT. To meet the strict ExAO fitting and servo error requirement (<90nm rms WFE), GMagAO-X must have 21,000 actuator DM capable of ≥2KHz correction speeds. To minimize wavefront/segment piston error GMagAO-X has an interferometric beam combiner on a vibration isolated table, as part of this “21,000 actuator parallel DM”. Piston errors are sensed by a Holographic Dispersed Fringe Sensor (HDFS). In addition to a coronagraph, it has a post-coronagraphic Low Order WFS (LLOWFS) to sense non-common path (NCP) errors. The LLOWFS drives a non-common path DM (NCP DM) to correct those NCP errors. GMagAO-X obtains high-contrast science and wavefront sensing in the visible and/or the NIR. Here we present our successful externally reviewed (Sept. 2021) CoDR optical-mechanical design that satisfies GMagAO-X’s top-level science requirements and is compliant with the GMT instrument requirements and only requires COTS parts.

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Laird M. Close, Jared R. Males, Olivier Durney, Fernando Coronado, Sebastiaan Y. Haffert, Victor Gasho, Alexander Hedglen, Maggie Y. Kautz, Tom E. Connors, Mark Sullivan, Olivier Guyon, and Jamison Noenickx "The optical and mechanical design for the 21,000 actuator ExAO system for the Giant Magellan Telescope: GMagAO-X", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218524 (29 August 2022); https://doi.org/10.1117/12.2629553

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